Heat dissipating tube sintered with copper powders

ABSTRACT

A heat dissipating tube with copper powders comprises a metal tube; an inner wall of the metal tube having at least one non-flat portion; and a plurality of copper powders adhered on the inner wall of the metal tube. There are a plurality of non-flat portions which are distributed along a periphery of a cross section of the metal tube. A cross section of the non-flat portion has a shape selected from one of trapezoids, rectangular shapes, semi-round shapes, sector shapes, sawtooth shapes, triangular shapes, or other irregular shape. The non-flat portion may be selected from one of at least one trench, at least one protrusion and at least one groove.

FIELD OF THE INVENTION

The present invention relates to heat dissipating tubes, and in particular to a heat dissipating tube, wherein more copper powders can be adhered to the inner wall of the metal tube so that more heat can be transferred to the copper powders. Thereby the heat dissipating ability of the heat dissipating tube is increased.

BACKGROUND OF THE INVENTION

To have a better heat dissipation ability to computer CPUs (central processing units), heat dissipating tube is widely used in CPU for dissipating heat. Currently, low boiling points, evaporated liquid (such as water) is filled within the heat dissipating tube. In vacuum state, liquid will evaporate to carry heat of the metal tube from one end to another end, when the temperature is decreased, the liquid will return to the original place. Generally, the surface of the metal tube is coated with copper powders so as to absorb more heat from the metal tube to further increase the heat dissipating ability of the heat dissipating tube, as shown in FIG. 1. However this prior art has the following disadvantages.

The inner wall of the metal tube is smooth so that copper powders can not be easily sintered to the surface of the inner wall of the metal tube. Furthermore, the surface area of the copper powders adhered to the metal tube is smaller so that the heat can be transferred to the copper powders is confined. Thereby the copper powders cannot be firmly secured to the surface of the metal tube.

SUMMARY OF THE INVENTION

Accordingly, the primary object of the present invention is to provide a heat dissipating tube, wherein more copper powders can be adhered to the inner wall of the metal tube so that more heat can be transferred to the copper powders. Thereby the heat dissipating ability of the heat dissipating tube is increased.

To achieve above objects, the present invention provides a heat dissipating tube which comprises a metal tube; an inner wall of the metal tube having at least one non-flat portion; and a plurality of copper powders adhered on the inner wall of the metal tube. There are a plurality of non-flat portions which are distributed along a periphery of a cross section of the metal tube. A cross section of the non-flat portion has a shape selected from one of trapezoids, rectangular shapes, semi-round shapes, sector shapes, sawtooth shapes, triangular shapes, or other irregular shape. The non-flat portion may be selected from one of at least one trench, at least one protrusion and at least one groove.

The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing the prior art metal tube with sintering copper powders on an inner wall thereof.

FIG. 2 is a cross sectional view about first embodiment of the present invention.

FIGS. 3A and 3B are a schematic view about the second embodiment of the present invention.

FIG. 4 is a schematic view about the third embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.

FIRST EMBODIMENT

A metal tube 1 is an aluminum tube or a tube made of other metals. An inner wall of the metal tube 1 is formed with a plurality of trenches 2. As shown in FIG. 2, each trench 2 is extended along an axial direction of the metal tube 1. The trenches 2 are distributed along a periphery of the metal tube 1. A cross section of the trench 2 approximately vertical to an axial direction of the metal tube 1 has a trapezoid, a rectangular shape, a semi-round shape, a sector shape, a sawtooth shape, a triangular shape, or other irregular shape. After sintering, copper powders 3 will adhere to inner surfaces of the trenches 2 and the inner wall of the metal tube 1. The copper powders 3 are not only in contact with inner bottoms of the trenches 2, but also inner lateral walls of the trenches 2. Thereby the area of the copper powders 3 contacting to the inner side of the metal tube 1 is greatly increased. In the sintering process, the copper powders 3 are firmly secured to the metal tube 1.

SECOND EMBODIMENT

As shown in FIGS. 3A and 3B, a metal tube 1 is an aluminum tube or a tube made of other metals. An inner wall of the metal tube 1 is formed with a plurality of protrusions 4. The protrusions 4 are adhered to the inner wall of the metal tube 1, as shown in FIG. 3A, or the protrusions 4 are integrally formed with the metal tube 1, as shown in FIG. 3B. The protrusions 4 are distributed along a periphery of the metal tube 1. A cross section of each protrusion 4 approximately vertical to an axial direction of the metal tube 1 has a trapezoid, a rectangular shape, a semi-round shape, a sector shape, a sawtooth shape, a triangular shape, or other irregular shape. Recesses are formed between the protrusions 4. After sintering process, copper powders 3 are adhered to the surfaces of recesses or the surfaces of the protrusions 4. The copper powders 3 are not only in contact with inner bottoms of the protrusions 4, but also inner lateral walls of the protrusions 4. Thereby the area of the copper powders 3 contacting to the inner side of the metal tube 1 is greatly increased. In the sintering process, the copper powders 3 are firmly secured to the metal tube 1.

THIRD EMBODIMENT

A metal tube 1 is an aluminum tube or a tube made of other metals. An inner wall of the metal tube 1 is formed with a plurality of grooves 2. As shown in FIG. 4, each groove 2 is extended along an axial direction of the metal tube 1. The grooves 2 are distributed along a periphery of the metal tube 1. A cross section of the groove 2 approximately vertical to an axial direction of the metal tube 1 is a trapezoid, a rectangular shape, a semi-round shape, a sector shape, a sawtooth shape, a triangular shape, or other irregular shape. Furthermore, the grooves 2 are distributed as a honeycomb. After sintering, copper powders 3 will adhere to inner surfaces of the grooves 2 and the inner wall of the metal tube 1. The copper powders 3 are not only in contact with inner bottoms of the grooves 2, but also inner lateral walls of the grooves 2. Thereby the area of the copper powders 3 contacting to the inner side of the metal tube 1 is greatly increased. In the sintering process, the copper powders 3 are firmly secured to the metal tube 1.

The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 

1. A heat dissipating tube sintered with copper powders; the tube comprising: a metal tube; an inner wall of the metal tube having at least one non-flat portion; and a plurality of copper powders adhered on the inner wall of the metal tube.
 2. The heat dissipating tube as claimed in claim 1, wherein there are a plurality of non-flat portions which are distributed along a periphery of a cross section of the metal tube.
 3. The heat dissipating tube as claimed in claim 1, wherein a cross section of the non-flat portion has a shape selected from one of trapezoid shapes, rectangular shapes, semi-round shapes, sector shapes, sawtooth shapes, triangular shapes, or other irregular shapes.
 4. The heat dissipating tube as claimed in claim 1, wherein the non-flat portion is at least one trench formed on the inner wall of the metal tube and the inner wall of the trench is adhered with the copper powders.
 5. The heat dissipating tube as claimed in claim 4, wherein the at least one trench is extended along an axis of the metal tube.
 6. The heat dissipating tube as claimed in claim 1, wherein the non-flat portion is at least one protrusion formed on the inner wall of the metal tube and an outer wall of the protrusion is adhered with the copper powders.
 7. The heat dissipating tube as claimed in claim 6, wherein the at least one protrusion is adhered to the inner wall of the metal tube.
 8. The heat dissipating tube as claimed in claim 6, wherein the protrusion is integrally formed with the metal tube.
 9. The heat dissipating tube as claimed in claim 1, wherein non-flat portion is at least one groove formed on the inner wall of the metal tube and an inner wall of the groove is adhered with the copper powders.
 10. The heat dissipating tube as claimed in claim 4, wherein the at least one groove is extended along an axis of the metal tube. 